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  Java Practices -> Measure application performance
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<div class='page-title'>Measure application performance</div>

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<br>Measure your application's size in memory and its <a href="TopicActiondd78-2.html">execution speed</a>.
<p>Measuring performance throughout construction can help to identify <em>major</em> performance problems as quickly as possible, which is almost always beneficial. 
If a major problem becomes apparent, then some immediate redesign will likely be necessary.
If no major problem is apparent, then, if needed, <em>minor</em> optimizations can be performed later, when construction is nearly complete.
(Many would argue that worrying about <em>minor</em> optimizations during construction is not advisable, since optimizations can sometimes make code more obscure.)

<P>The excellent <a href="http://java.sun.com/javase/6/docs/technotes/tools/index.html#jconsole">JConsole</a> tool 
comes with JSE 6, and can be used to manage and monitor a local or remote Java Virtual Machine.

<p>If JConsole is not available, there are some other means of measuring an application's size in memory. 
They depend on your platform. For example:
<ul>
<li>
NT : Task Manager, look for java.exe or javaw.exe</li>

<li>
Unix : get the process id "<tt>ps -e | grep java</tt>", pass it to
<tt>pmap</tt>, as in "<tt>pmap -x 6598</tt>", and look for total KB entry
in the Private column</li>
</ul>

<P>As well, the JDK itself comes with basic profiling tools. For example :
<ul>
<li><tt>Runtime.<a href='http://java.sun.com/javase/6/docs/api/java/lang/Runtime.html#freeMemory()'>freeMemory()</a></tt>
<li><tt>Runtime.<a href='http://java.sun.com/javase/6/docs/api/java/lang/Runtime.html#totalMemory()'>totalMemory()</a></tt>
<li><tt>java -<a href='http://java.sun.com/javase/6/docs/technotes/tools/windows/java.html#nonstandard'>Xprof</a> MyClass</tt></li>
<li><tt>java -<a href='http://java.sun.com/developer/technicalArticles/Programming/HPROF.html'>Xrunhprof</a>:[<em>options</em>] MyClass</tt></li>
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<div class='topic-section'>See Also :</div>
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  <a href='TopicActione704-2.html?Id=83'>Get size of object in memory</a> <br>
 
  
  <a href='TopicActiondd78-2.html?Id=85'>Time execution speed</a> <br>
 
  
  <a href='TopicActioncfcd-2.html?Id=98'>Measure web app performance</a> <br>
 
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